Tascam DM24 user question

I'm trying to configure my DM24 for something that I thought it would do... I want to set channels 1-8 to be direct outs to the ADAT port. Then set 9-16 to be direct outs to the ADAT expansion card in slot one. Currently, 1-8 direct out works fine... However 9-16 outputs white noise. What can I possibly be doing wrong? A better question is; is what I want to do even possible with the DM24, and is anyone doing it???

It worked for me together with a rme 9652 Soundcard via Adat-Connection switching Chanel 9 for example to "direct" on the channel assign.
Controlling the RME-Mixer-Software, i have a correct input on the second Adat-In (first ist connected to the normal Tascam-Adat-Connector)

The rme 9652 is the same sound card that I have. I have no explanation at this point other than there must be a problem with my expansion card. I doubt that there is a problem with both expansion slots on my mixer, so I'll start with the card. I've posted this question on several different groups, and so far, no solution.